#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#include<set>
#include <functional>
#include <list>
#include <thread>
#include <mutex>
#include <unordered_set>
#include <unordered_map>


using namespace std;
